asp.net 2.0 button with return false javascript STILL POSTING BACK!!!

I have 4 hours in this and I don't get it. I have tried every example. Is there not a way to stop post the form by returning false from javascript? even this doesn't work...
function thisFunc()
{ return false; }
It is executing but does not stop the post. Code below

This is what is so strange. It is exactly how I started this out and it did not work. I have tried this and many other implementations and nothing stops the postback. Could it have someting to do with Masterpages, which is another piece to this environment?
I tried just as you have demonstrated with no code in javascript other than return = false; and it still posts back. Any idea what I have wrong?

Yes... I just read a few blogs and big argument cuz it works on about 50% of situations so the ones it works on, of course, say to the others, "Yes it does work" blah blah....
Going to try that fix now.

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